EMERSON 3A99166G05 Ovation DCS Control Circuit Board

June 05, 2026

EMERSON 3A99166G05 Ovation DCS Control Circuit Board

3A99166G05 is the finalized upgraded LVDT signal conditioning Eurocard for Ovation DEH turbine governing system, perfectly matched with full-series 3A99165 servo amplifier modules (3A99165G50/G51 etc.) and 3A99164 main control card for thermal & nuclear power unit valve closed-loop control.

Description

Part No.:3A99166G05｜Emerson (Westinghouse Legacy) Ovation DEH Turbine Control Module, Latest upgraded revision of 3A99166G series (G0/G03/G05), direct drop-in replacement for all former G revision cards

1. Product Overview

This module supplies standardized AC excitation to field-mounted LVDT displacement transducers on turbine stop valves, control valves and bypass valves; acquires weak millivolt AC position feedback signals from LVDTs, then implements rectification, multi-stage filtering and precision amplification, finally outputs calibrated ±10VDC analog position signal as setpoint input for downstream servo boards to realize precise valve stroke closed-loop regulation. It follows standard single-width Ovation rack dimension, fully pin-compatible with G0/G03 without cabinet wiring modification.

2. Core Electrical Specifications

Backplane power supply: +5VDC, ±12VDC powered by Ovation 3A99132 rack power supply module
Excitation output: 3kHz,7VAC stable sine-wave for independent multi-channel LVDT loops; G05 optimizes internal oscillator circuit for ultra-low fluctuation under unstable cabinet auxiliary power
Onboard protection: independent channel fuse, TVS lightning surge suppression, multi-order RC anti-jamming filter, improved overcurrent & short-circuit latch protection (optimized fault lockout logic vs G0/G03 editions)
Standard output: precision-calibrated ±10VDC full-scale DC analog signal, consistent input specification for all 3A99165 servo series cards

3. Environmental & Mechanical Parameters

Operating ambient temperature inside control cabinet: -15℃ ~ +72℃; storage temperature: -40℃ ~ +90℃
Full PCB conformal coating: upgraded three-layer anti-moisture, anti-mold, anti-salt-spray coating to adapt high-humidity, dusty power plant cabinet environment
EMC certification: fully compliant with IEC61000 industrial EMC standard; enhanced internal EMI suppression circuit to eliminate interference from site contactors and variable-frequency drives
Form factor: standard single-slot Ovation plug-in board, compatible with universal DEH system rack slots

4. Front Panel & Installation Features

Front panel LED indicators for board power status and per-channel failure alarm; reserved test terminals for field multimeter measurement of excitation AC voltage and conditioned DC output during commissioning and routine maintenance
Supports hot-swap replacement under rack standby condition; critical turbine control loops generally deploy redundant dual-card configuration to maximize system operational safety; G05 completely fixes original zero drift and signal jitter defects existed on early G0/G03 batches

5. Spare Part & Field Troubleshooting Guide

Original OEM formal production has been discontinued; available stock includes brand-new surplus original stock and fully bench-tested refurbished modules with standard 12-month factory warranty.

No LVDT excitation output: blown channel onboard fuse or abnormal backplane input power voltage
Continuous signal wandering & fluctuation: loose field LVDT wiring terminals or aging filter components
DC output zero offset drift: oxidized PCB gold finger contacts or degraded preamplifier chips (rare failure on optimized G05 version)

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